[Pulmonary hypertension associated with left heart diseases: pathophysiology, diagnosis, treatment]

Pulmonary hypertension (PH) is a common complication of diseases affecting the left heart, mostly found in patients suffering from heart failure. Left atrial hypertension is the initial driver of post-capillary PH. However, several mechanisms may lead in a subset of patients to structural changes in the pulmonary vessels with development of a pre-capillary component. The right ventricle may be frequently affected, leading to right ventricular failure and a worse outcome. The differential diagnosis of PH associated with left heart disease vs pulmonary arterial hypertension (PAH) is challenging in patients with cardiovascular comorbidities, risk factors for PAH and/or a preserved left ventricular ejection fraction. Multidimensional clinical phenotyping is needed to identify patients in whom hemodynamic confirmation is deemed necessary, that may be completed by provocative testing in the cath lab. In contrast with PAH, management of PH associated with left heart disease should focus on the treatment of the underlying condition. There is currently no approved therapy for PH associated with left heart disease: some PAH-specific treatments have led to an increase in adverse events in these patients.